Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D495/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms
  • C07D495/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms in which the condensed system contains two hetero rings
  • C07D495/04—Ortho-condensed systems
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
  • A61P1/08—Drugs for disorders of the alimentary tract or the digestive system for nausea, cinetosis or vertigo; Antiemetics
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/02—Drugs for disorders of the nervous system for peripheral neuropathies
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/18—Antipsychotics, i.e. neuroleptics; Drugs for mania or schizophrenia
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/20—Hypnotics; Sedatives
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D333/00—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom
  • C07D333/02—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings
  • C07D333/04—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom
  • C07D333/26—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D333/38—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals

Definitions

• This invention relates to novel organic compounds and the use thereof as pharmaceuticals.
• drugs are associated with a sedative effect and may also have an undesirable influence on the affective symptoms of the disease, causing depression. In some instances long term use of the drug leads to irreversible conditions, such as the tardive dyskinesia and tardive dystonia referred to above.
• a widely-used antipsychotic, haloperidol is one such drug, which has been reported as causing a high incidence of extra pyramidal symptoms and may also cause tardive dyskinesia.
• clozapine one of a large group of tricyclic antipsychotics, has been introduced with the claim that it is free from extra pyramidal effects.
• the compound was found to cause agranulocytosis in some patients, a condition resulting in a lowered white blood cell count which can be life-threatening, and it may now only be employed under very strict medical observation and supervision.
• a further group of antipsychotic compounds is that described in British Patent 1 533 235. These include thieno-benzodiazepines having the following structural nucleus.
• flumezapine (7-fluoro-2-methyl-10-(4-methyl-1-piperazinyl)-4H-thieno-(2,3-b][1,5]-benzodiazepine)
• flumezapine (7-fluoro-2-methyl-10-(4-methyl-1-piperazinyl)-4H-thieno-(2,3-b][1,5]-benzodiazepine)
• a total of 17 patients received treatment with flumezapine before the clinical trial was terminated after consultation with- the U.S. Food and Drug Administration, because of an unacceptably high incidence of raised enzyme levels in the treated patients.
• flumezapine is similar to chlorpromazine, an antipsychotic which has long been in use but whose safety has been called into question.
• the compound of the invention is of the formula or an acid addition salt thereof.
• the free base of formula (I) is 2-methyl-10-(4-methyl-1-piperazinyl)-4H-thieno[2,3-b][1,5]benzodiazepine.
• the compound of the invention is named 2-methy!-4-(4-methy!-1 -piperaziny!)-1 OH-thieno[2,3-b][1,5]benzodiazepine.
• the compound of the invention has given surprising and excellent results, described in greater detail below, in experimental screens for testing activity on the central nervous system and in clinical trials, which results indicate its usefulness for the relatively safe and effective treatment of a wide range of disorders of the central nervous system.
• the compound of the invention is an antagonist of dopamine at D-1 and D-2 receptors, and in addition has antimuscarinic anti-cholinergic properties and antagonist activity at 5HT-2 receptor sites. It also has antagonist activity at noradrenergic a-receptors. These properties indicate that the compound is a potential neuroleptic with relaxant, anxiolytic or anti-emetic properties, and is useful in treating psychotic conditions such as schizophrenia, schizophreniform diseases and acute mania. At lower doses the compound is indicated for use in the treatment of mild anxiety states.
• the compound of the invention has shown a high level of activity in the clinical evaluation of psychiatric patients suffering from schizophrenia, and it exhibits this high activity at surprisingly low dosage levels.
• the dosage levels have been found to be lower than would be expected from observations of the compound made in initial tests on animal models.
• Its response profile in patients follows that of known antipsychotic agents when they have been used successfully, there being a clear similarity between the performance of the compound and that of known antipsychotic agents in its ratings on the major assessment scales such as Brief Psychiatric Rating Scale (BPRS) (Schizophrenia Sub-scale), and Clinical Global Impression (CGI).
• BPRS Brief Psychiatric Rating Scale
• CGI Clinical Global Impression
• the compound of the invention causes lower elevation of prolactin levels than other currently used neuroleptic drugs and this suggests fewer disturbances of the menstrual cycle, and less gynecomastia and galactorrhea. No alteration of white blood cell count has been observed in clinical studies.
• the compound of the invention shows marked superiority, and a better side effects profile than prior known antipsychotic agents, and has a highly advantageous activity level.
• the compound of the invention can be used both in its free base and acid addition salt forms.
• the acid addition salts are preferably the pharmaceutically acceptable, non-toxic addition salts with suitable acids, such as those of inorganic acids, for example hydrochloric, hydrobromic, nitric, sulphuric or phosphoric acids, or of organic acids, such as organic carboxylic acids, for example glycollic, maleic, hydroxymaleic, fumaric, malic, tartaric, citric or lactic acid, or organic sulphonic acids for example methane sulphonic, ethane sulphonic, 2-hydroxyethane sulphonic, toluene-p-sulphonic or naphthalene-2-sulphonic acid.
• suitable acids such as those of inorganic acids, for example hydrochloric, hydrobromic, nitric, sulphuric or phosphoric acids
• organic acids such as organic carboxylic acids, for example glycollic, maleic, hydroxymaleic, fumaric
• acid addition salts are included in the invention, for example, those with picric or oxalic acid, since they have potential to serve as intermediates in purification or in the preparation of other, for example, pharmaceutically acceptable, acid addition salts, or are useful for identification, characterisation or purification of the free base.
• the radical Q can, for example, be an amino group or a mono- or dialkyl-substituted amino group (each alkyl substituent suitably containing 1 to 4 carbon atoms), hydroxyl, thiol, or an alkoxy, alkylthio or alkylsulphonyl group suitably containing 1 to 4 carbon atoms, for example a methoxy or methylthio group, or a halogen atom, especially a chlorine atom.
• Q is amino (-NH 2 ), hydroxyl or thiol, and amino is most preferred.
• the reaction is preferably carried out at a temperature of from 50 ° C to 200 °C.
• the intermediate of formula (II) may also exist in the imino form: and when Q is hydroxyl or thiol, the intermediates of formula (II) may exist in their amide and thioamide forms:
• the amidine of formula (II) (Q is -NH 2 ), can be in salt form, for example a salt of a mineral acid such as the hydrochloride, and can be reacted with N-methylpiperazine in an organic solvent such as anisole, toluene, dimethylformamide or dimethyl-sulphoxide, preferably at a temperature range of 100 to 150°C.
• an organic solvent such as anisole, toluene, dimethylformamide or dimethyl-sulphoxide
• the amidine is prepared by condensing a thiophene compound of formula with an ortho-halonitrobenzene, in the presence of a base, for example sodium hydride, in a solvent such as tetrahydrofuran or n-butyl lithium in tetrahydrofuran, or potassium carbonate or lithium hydroxide in dimethylsulphoxide or with a tetraalkylammonium salt in a two-phase system, to form a nitronitrile of formula: which can be simultaneously reduced and ring-closed to the amidine of formula (II) employing, for example, stannous chloride and hydrogen chloride in aqueous ethanol or, alternatively by reduction with hydrogen and palladium/carbon or ammonium polysulphide followed by acid-catalysed ring closure.
• a base for example sodium hydride
• a solvent such as tetrahydrofuran or n-butyl lithium in tetrahydrofuran, or potassium carbonate
• reaction (a) is preferably carried out in the presence of titanium tetrachloride which has the ability to react with the N-methylpiperazine to form a metal amine complex.
• titanium tetrachloride which has the ability to react with the N-methylpiperazine to form a metal amine complex.
• Other metal chlorides such as those of zirconium, hafnium or vanadium may also be employed.
• the reaction can be carried out in the presence of an acid binding agent such as a tertiary amine, for example, triethylamine.
• reaction can be carried out using excess of N-methylpiperazine to act as an acid- binding agent.
• a suitable organic solvent such as toluene or chlorobenzene can be used as a reaction medium, although the use of anisole is particularly desirable, at least as a co-solvent, in view of its ability to form a soluble complex with TiCl 4 .
• elevated temperatures for example up to 200 °C, can be used to hasten the reaction and a preferred temperature range for carrying out the reaction is from 80°C to 120°C.
• the intermediate amide of formula (II) (Q is -OH) can be prepared from the corresponding amidine (Q is -NH 2 ) by alkaline hydrolysis, or can be derived from compounds of formula
• R is an ester group, preferably C 1 - 4 alkyl
• ring closure employing, for example, sodium methylsulphinyl methanide in a suitable solvent such as dimethylsulphoxide.
• the amide can be prepared by ring closure of an amino-acid, employing for example dicyclo-hexylcarbodiimide (DCC) in a suitable solvent such as tetrahydrofuran.
• DCC dicyclo-hexylcarbodiimide
• the amino-acid can be obtained for example from the above esters by basic hydrolysis using for example sodium hydroxide in ethanol.
• Thioamides of formula (II) (Q is -SH), iminothioethers, iminoethers or iminohalides, or other derivatives containing active Q radicals as specified above, tend to be more reactive towards N-methylpiperazine and can usually be reacted without the necessity for the presence of TiCl 4 , but otherwise employing the same conditions of temperature and solvent.
• the thioamide of formula (II) (Q is -SH) can be prepared by treating a solution of the corresponding amide in an anhydrous basic solvent, such as pyridine, with phosphorous pentasulphide.
• an anhydrous basic solvent such as pyridine
• the amide can be converted to the iminothioether, iminoether or iminohalide, or other derivatives containing active Q radicals, by treatment with conventional reagents such as for example in the case of the iminochloride, phosphorous pentachloride.
• the compound of formula (III) may be ring-closed by employing, for example, titanium tetrachloride as catalyst and anisole as solvent, and the reaction is preferably carried out at a temperature of 100 ° C to 250 ° C, for example from 150 ° C to 200 °C.
• the intermediate compound of formula (III) is preferably prepared in situ without isolation by reacting a compound of formula in which R is an ester group, preferably C 1 - 4 alkyl, with N-methylpiperazine, by heating to a temperature of between 30 °C and 120°C, for example about 100°C, in a suitable solvent such as for example anisole, and employing TiCI4 as catalyst.
• the compound of formula (IV) can be prepared from the corresponding nitro compound of formula
• Such compounds of formula (V) in which R is an ester group, such as for example C 1 - 4 alkyl, are novel and form a further aspect of the invention.
• Intermediate compounds of formula (V) can be made by condensation of a thiophene of formula with an ortho-halonitrobenzene, preferably ortho fluoro- or chloro- nitrobenzene, in the presence of a base, for example, (a) sodium hydride in a solvent such as for example tetrahydrofuran and at a temperature of from -20 °C to 30 °C, or (b) anhydrous potassium carbonate or lithium hydroxide in a solvent such as dimethylsulphoxide at a temperature of from 90 ° C to 120°C.
• a base for example, (a) sodium hydride in a solvent such as for example tetrahydrofuran and at a temperature of from -20 °C to 30 °C, or (b) anhydrous potassium carbonate or lithium hydroxide in a solvent such as dimethylsulphoxide at a temperature of from 90 ° C to 120°C.
• the compound of formula (V) is converted to that of formula (IV) by reduction, for example catalytically, employing hydrogen and palladium/carbon, or chemically, employing stannous chloride and hydrogen chloride in aqueous ethanol, or ammonium polysulphide, or zinc in aqueous ammonium chloride.
• the compound of the invention has useful central nervous system activity. This activity has been demonstrated in models using well-established procedures. For example, the compound has been assessed in a number of standard behavioural tests predictive of antipsychotic activity. It antagonised apomorphine-induced climbing behaviour and hypothermia in mice (Moore, N.A. et al. Psychopharmacology 94 (2), 263-266 (1988), and 96, 539 (1988)) at doses of less than 10 mg/kg. The compound also inhibited a conditioned avoidance response in rats (EDso 4.7 mg/kg), but unlike standard compounds, it induced catalepsy only at much higher doses (EDso 39.4 mg/kg). This separation between the doses required to block a conditioned avoidance response and to induce catalepsy indicates that the compound is less likely to induce extrapyramidal side effects in the clinic
• the compound of the invention was also active at doses of less than 10 mg/kg in a test based on the apomorphine-induced climbing test referred to above, which measured the ability of the compound to prevent the disruption of climbing response produced by 24 hour pre-treatment with N-ethoxycarbonyl-2- ethoxy-1,2-dihydroquinoline (EEDQ), a dopamine receptor inactivating agent (Meller et al. Central D1 dopamine receptors, Plenum Press, 1988). This test shows that the compound possesses activity at both the D-1 and D-2 receptors.
• EEDQ N-ethoxycarbonyl-2- ethoxy-1,2-dihydroquinoline
• the compound of the invention has been found to have a favourable profile of activity in a number of in vitro binding assays, designed to measure the degree of binding to neural receptors.
• the compound is active at both the dopamine D-1 and D-2 receptors as indicated by an IC 50 of less than 1 ⁇ M in the 3 H-SCH23390 (Billard, W. et al. Life Sciences 35 1885 (1984)) and the 3 H-spiperone (Seeman, P. et al. Nature 261 717 (1976)) binding assays respectively.
• the compound has an IC 50 of less than 1 ⁇ M in the 3 H-QNB binding assay described by Yamamura, HI and Snyder, SH in Proc.Nat.Acad.Sci. USA 71 1725 (1974) indicating that it has antimuscarinic-anticholinergic activity.
• the compound shows its greatest activity at the 5-HT-2 receptor in that it displaces H-spiperone from binding sites in the rat frontal cortex (Peroutka, SJ and Snyder, SH Mol. Pharmacol. 16 687 (1979)) at low nanomolar concentrations.
• the compound is also active at the 5-HT-IC receptor.
• the compound of the invention is effective over a wide dosage range, the actual dose administered being dependent on the condition being treated.
• dosages of from 0.05 to 30 mg, preferably from 0.1 to 20 mg, per day may be used.
• a once a day dosage is normally sufficient, although divided doses may be administered.
• a dose range of from 2 to 15 mg, preferably 2.5 to 10 mg per day is suitable, whereas for mild anxiety states a lower dosage range, such as from 0.1 to 5 mg, preferably 0.5 to 1 mg, may be more appropriate.
• the compound of the invention will normally be administered orally or by injection and, for this purpose, it is usually employed in the form of a pharmaceutical composition.
• the invention includes a pharmaceutical composition
• a pharmaceutical composition comprising as active ingredient a compound of formula (I) or a pharmaceutically acceptable acid addition salt thereof, associated with a pharmaceutically acceptable carrier.
• the active ingredient will usually be mixed with a carrier, or diluted by a carrier, or enclosed within a carrier which may be in the form of a capsule, sachet, paper or other container.
• the carrier serves as a diluent, it may be solid, semi-solid or liquid material which acts as a vehicle, excipient or medium for the active ingredient.
• the active ingredient can be adsorbed on a granular solid container for example in a sachet.
• compositions of the invention may, if desired, be formulated so as to provide quick, sustained or delayed release of the active ingredient after administration to the patient.
• compositions may be formulated as tablets, capsules, injection solutions for parenteral use, suspensions or elixirs for oral use or suppositories.
• compositions are formulated in a dosage unit form, each dosage containing from 0.1 to 20 mg, more usually 0.5 to 10 mg, of the active ingredient.
• a preferred formulation of the invention is a capsule or tablet comprising 0.1 to 20 mg or 0.5 to 10 mg of active ingredient together with a pharmaceutically acceptable carrier therefor, or a formulation in capsule or tablet form comprising from 2.5 to 5 mg of a compound of formula (I) together with a pharmaceutically acceptable diluent or carrier therefor.
• a further preferred formulation is an injection which in unit dosage form comprises 0.1 to 20 mg or 0.5 to 10 mg of active ingredient together with a pharmaceutically acceptable diluent therefor.
• a type of injection formulation that is especially desirable is a sustained release formulation for intra-muscular injection.
• Methyl 2-(2-nitroanilino)-5-methylthiophene-3-carboxylate (3.7 g, 0.0013 mol) was hydrogenated in a Parr apparatus at 60 psi in ethanol-ethyl acetate (2:1, 150 mL) with palladium on charcoal catalyst (10%, 200 mg). After removal of catalyst and solvent the crude diamino-ester was dissolved in a mixture of N-methylpiperazine (21 mL) and anisole (55 mL). To this solution, under a nitrogen atmosphere was added, with stirring, a solution of titanium tetrachloride (3.45 mL) in anisole (15 mL). The mixture was stirred at 100 ° C for 1 hour, then under reflux for 48 hours to effect ring closure of 1- ⁇ [2-(2-amino-anilino)-5-methylthiophen-3-yl]carbonyl)-4-methylpiperazine.
• a pulvule formulation is prepared by blending the active with silicone starch, and filling it into hard gelatin capsules.
• a tablet formulation is made by granulating the active with appropriate diluent, lubricant, disintegrant and binder and compressing
• An aqueous injection of active is prepared as a freeze-dried plug, for reconstitution in a suitable, sterile diluent before use (to a total volume of 10 ml).
• a controlled release injection for intramuscular injection is formed from a sterile suspension of micronised active in an oleaginous vehicle.
• a formulation is prepared by blending the active with silicone starch and starch, and filling it into hard gelatine capsules.

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